[填空题]
Suppose David puts a*e kfw.qnr/,b 0.50-kg rock in tr djo-q+/gfehxg 5iu41xq +w+84txbto a sling of length 1.5 m and begins whirling the rock in a nearly horizontal circle above hiq+1gh4bt8dxf 5uwr-o/x++e tx jgi4 qs head, accelerating it from rest to a rate of 120 rpm after 5.0 s. What is the torque required to achieve this feat, and where does the torque come from? $m \cdot N$
Post time 2025-2-18 20:00:22
